Highlight passages, draw freehand, add boxes and sticky notes on any PDF page, then export a real annotated PDF. Runs entirely in your browser.
Annotate PDF lets you highlight passages, draw freehand marks, add rectangle or box shapes, and drop sticky notes onto any page of a PDF, then export a genuine annotated PDF file. Everything happens in your browser, so you can markup pdf in browser without installing a dedicated PDF reader with annotation features.
Annotations are drawn directly into the page content when you export, meaning the highlighted text and comments display correctly in any standard PDF viewer afterwards, not just in this tool. That makes it suitable for reviewing documents you need to send back to someone else with your marks intact.
Highlighting, freehand drawing, shapes and sticky notes are all available, covering the common ways people mark up a document during review.
Marks are drawn into the page on export, so they display identically in any PDF reader afterwards, not only inside this tool.
Annotations can be added across every page of a document, with navigation to move between them while keeping earlier marks intact.
Highlighting and commenting on a PDF works directly in the browser without installing Acrobat or another PDF reader.
Marks are rendered directly into the page's visual content at export time, rather than stored as a separate removable comment layer. This guarantees they appear correctly wherever the PDF is opened next, though it also means annotations can't be toggled off again once exported.
Every page keeps its own set of annotations as you move between them using the page navigation, so a long document can be reviewed page by page without losing earlier highlights or notes.
Acrobat's native commenting layer keeps annotations editable and removable indefinitely, which suits ongoing collaborative review. This tool is better suited to a final markup pass where the annotations are meant to become a permanent part of the document.
Use highlighting for text passages and sticky notes for longer explanatory comments, keeping freehand drawing for pointing at specific diagram elements — mixing tools this way keeps a reviewed document easy to read afterwards.
They are drawn into the page content on export, so they display identically in every PDF reader.
Yes. Move between pages with the arrows and every mark is kept until you export the finished file.
Yes. Annotate PDF on Klipza is completely free with no account, no subscription and no watermark on your files, and there is no daily usage limit.
Processing happens locally in your browser wherever technically possible, so your files are not uploaded to a server, stored or shared with third parties.
Yes. It is fully responsive and runs in any modern browser on Android, iPhone, iPad, Windows and macOS — nothing to install.